Xylem XL Series H-522 - Plus - Manual (Page 126)

14-10 SDI-12 Operations
XL™ Series
SDI-12 Sensor Mode Status: Enabled Sensor Mode Enabled
The first message displayed here is a status message indicating if the SDI-12 sensor mode is
enabled or disabled. If the first parameter is set to ‘None’ then the unit is disabled as an SDI-12
sensor. Breaks and commands from other equipment will not be responded to by the system if it
is disabled.
A few of the newer SDI-12 sensors from some manufactures can be set up in different modes and
may cause the SDI-12 data line to go active when the sensor is not really using the SDI-12 mode.
This may cause the XL series logger to look for commands on the SDI-12 dat bus which causes it
to stop responding to other tasks. If the XL sensor mode is disabled it will ignore activity on the
SDI-12 data line.
PC Interface View Built In Display Screen
A - SDI-12 Address: 0 Sensor Mode Adrs [0]
Each SDI-12 sensor used within a network must have a unique address. Addresses are a single
character normally in the range of 0 to 9 but may include other characters like A to Z or a to z.
The default address for the H-350XL™ is '0', and the other XL series loggers uses the letter ‘Z’
as the default address.
NOTE: If the XL™ is used as the only data logger in the network, this address will have no
effect on the system and another SDI-12 sensor may have this same address.
PC Interface View Built In Display Screen
T - Total Measurement Time: 5 SDI Meas Time [005]
The measurement time is calculated by the system and is the time required to make all the
measurements requested. This time is dependant on how many parameters are used, what they
are, and the measurement time for each. The SDI-12 specification indicates the time may be from
0 to 999 seconds, and this time is reported to the data logger when the data logger requests the
sensor to take a measurement. When the unit calculates a measurement time this is a minimum
time and the user can increase it from that point. The system cannot calculate the measurement
time for all situations. For example, if basic programs are used or if long sampling times are
used for an analog input, then the user must adjust this time to account for the added time
required by these options.